我是這樣寫的代碼：首先，我用螞蟻創(chuàng)建例程池：var pool, _ = ants.NewPoolWithFunc(5, func(commitDiff interface{}) {    AnalyzeCommitDiff(commitDiff.(diffParsedType))})*函數(shù)分析提交Diff（） 包含我的antlr_analysis函數(shù)然后我寫了這些：var (    lexerPool *sync.Pool = &sync.Pool{New: func() interface{} {        return javaparser.NewJavaLexer(nil)    }}    parserPool *sync.Pool = &sync.Pool{New: func() interface{} {        return javaparser.NewJavaParser(nil)    }}    newTreeShapeListener *sync.Pool = &sync.Pool{New: func() interface{} {        return new(TreeShapeListener)    }})func executeJava(diffText string) javaparser.AnalysisInfoType {    input := antlr.NewInputStream(diffText)    lexer := lexerPool.Get().(*javaparser.JavaLexer)    defer lexerPool.Put(lexer)    lexer.SetInputStream(input)    stream := antlr.NewCommonTokenStream(lexer, 0)    p := parserPool.Get().(*javaparser.JavaParser)    defer parserPool.Put(p)    p.SetTokenStream(stream)    //p.AddErrorListener(antlr.NewDiagnosticErrorListener(true))    p.BuildParseTrees = true    p.GetInterpreter().SetPredictionMode(antlr.PredictionModeSLL)    tree := p.CompilationUnit()    listener := newTreeShapeListener.Get().(*TreeShapeListener)    defer newTreeShapeListener.Put(listener)    antlr.ParseTreeWalkerDefault.Walk(listener, tree)    return javaparser.Infos}但顯然存在問題，因?yàn)榫€程不安全。如何使代碼線程安全？誰能給我舉個例子嗎？